Designing a Mil-Std-105 or ANSI/ASQ Z1.4 Sampling Plan

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Mike S.

Happy to be Alive
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#13
johnnybegood said:
Need help on how to determine:
1) AQL
2) Producer’s risk
3) LTPD
4) Consumer’s risk


Supposing this is a new product.
Johnny,

Complete answers to your questions go beyond the scope of answers from the Cove I think. Some of these questions can only be answered by your organization and the customer. What do you/they want/need? Please take the time to read MIL-STD-105 or ANSI Z1.4 and you should have many of your questions answered by doing so (definitions are in there). Then, if you have a specific question write back.

BTW -- Most electrical components/products companies I have worked with use "single normal" sampling plans, General Inspection Level II. This may or may not work for you.
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#15
Sam said:
Mil-hdbk-53, if it is still available. Otherwise, I would suggest a trip to your local library.
Mil-hdbk-53 is available at CarolX's link.
 
M

M Greenaway

#17
AQL - Acceptable Quality Level, normally contractually agreed between supplier and customer. Very helpful if the AQL is near to your process capability for defect rates.

Producers risk - The portion of batches above the OC curve where it bisects the AQL which might be rejected even though their proportion defective is within the AQL level.

LTPD - Lot Tolerance Percentage Defective, again probably contractually agreed. Set to a batch defect rate at which we want to be sure most batches will be rejected.

Consumers risk - The portion of batches below the OC curve where it bisects the LTPD which might be accepted even though their proportion defective is beyond the LTPD.
 
J

johnnybegood

#18
Do I need to know all the 4 information (AQL, alpha, LTPD, beta) to determine the sampling plan? I came across some example which only requires AQL and alpha. Pls. advise.
 
J

johnnybegood

#20
If AQL=0.065, alpha = 0.05 refering to the chart, if my lot size is between 3201 to 10,000 the sample size required is 200. What if my lot size is 91 to 150, what would the sample size be? Is it 20 ?
 
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